Form for concrete



July 3, 1928. 1,675,749

. I P. M. CRAWFORD FORM FOR CONCRETE Filed March 25, 1927 Ill I [/2 I 13 {I 11 5 4 7, 14 44 L H g KIT/v p uni-m STAUTE'HS;

Patented July 3, 1928.

PATENT OFFICE.

masses m. caawronn, or rir'rsnoadn, rnnnsrnvama.

FQE concerns.

7 Application filed'jM arch 25, 1927. SeriaiNc. 178,802.

This invention relates to forms used for making concrete structures andmore in; particular to metallic forms for concrete beams.

The primary object of this invention is to provide means whereby theforms for easting concrete beams may be easily connected and secured tothe forms for the concrete columns by which said beams are to besupported.

Another object of this invention is the provision of metallic concrete 7forms for beams which are strong and durable and which, owing to thesmoothness of the material used, will produce concrete casts of finishedappearance.

A further object is to provide beamforms which may be easily removedafter the concrete has hardened and in which the component parts thereofmay be used indefinitely. Additional features and advantages of thisinvention will appear from the following description considered inconnection with the accompanying drawing forming a part of thisapplication, and in which:

Fig. 1 is a perspective view showing a form for a concrete beam used inconnection with a form for a concrete column and supported by ashore-post ofthe adjustable type. a

Fig. 2 is an enlarged perspective view of a column-form shown in Fig. 1.

Fig. 3 is a fragmentary perspective view showing one end ortion of aform for a concrete beam, bui t according to this invention.

Fig. 4 is a fragmentary perspective view of the bottom plate of thebeam-form.

Fig. 5 is a fragmentary view showing the method of connecting the clampsof the column-form at the corners of said form.

In Fig. 1 I have shown m invention as used in connection with a coumn-form intended for molding a square concrete column, the four sidesof this form being preferably built up of more than one plate, such asthe plates 1 and 2. These plates are held in proper alinement by meansof angle iron clamps 3 which are removably secured to the plates bymeans of bolts 4 having preferably conic heads adapted to fitcountersunk'holes drilled in the plates, so as to leave the interior ofthe form quite smooth. The clamps are disposed on the form in such amanner that the horizontal flange of one clamp will contact with thehorizontal flanges of the two adjacent rectangularly disposed clamps, asplainly shown in the drawing.

The four sides of the form are firmly held together by securin theseclamps at the four corners of the Eorm by means of bolts 5 insertedthrough registering holes 6 suitably located on the horizontal flangesof said clam s. If desired, the plates may be additiona ly boundtogether by means of the hinged cleat and pin connections 7 disposedintermediate the angle-clamps.

The form for a concrete. beam comprises two side Walls 8 of suitableheight and a bottom made of two plates 9 and 10. This beam-form isfurthermore characterized by the fact that its length is made up of twoparts, the long part 11 corres onding to the minimum span of standardshort part 11" bein of such length as to make up for the di erence inlonger spans.

The sides and the bottom of the beamform are secured together by meansof' the angle iron stiffeners 12, the ties 13 and the 7 bolts 14 havingconic heads to insure smooth surfaces inside the form. Bolts 15,inserted through holes 15 in the ties, are used to secure the stiflenersand ties together.

The long and short portions of the beamform are preferably unitedtogether in the manner shown especially in Fig. 3. As shown therein, atboth ends of the long side plates are permanently secured the shortangles 16 having one flange flush with the end of the form. A channeltie 17 is removabl bolted to the bottom plates and the side sti eners 18are secured to the side-plates 8 by means of the bolts 48 and to theinner flange of the channel 17 by the bolts 49. Similarly, at thecorresponding end of the short section, short angles 19 are permanentlysecured to the sides 8 and an angle iron tie 20 is removably secured tothe bottom plates. Both sections are connected together by boltingtogether the short angles 16, 19 and the ties 17 and 20.

To secure the short beam section to the column-form, I make use of theauxiliary channel-shaped spacers 21 and the short angles 22. The formerare first secured on the column-form by means of cone-headed boltsinserted in suitable holes 23 provided in the column-form and in theouter flange of the channel-spacers; the beam-form is then connected tothe column-form by bolting the short angles 22 to said spacers. The

ams and the reason for using the spacer elements is that it facilitatesthe attachment orremoval of the betsm formby providing mm iwsrking spacein a normally crowded location, also because of the fact that thecolumns are cast before the beams sothat the insertion of'the' boltsthrough the apertures 23 should be done before pouring the concrete toprevent plugging of said apertures. The bottomplates of the shortsection are supported on the column-form by the upright channel-tie. 24,secured in any desired manner to the column-form.

Changes iuthcprccise construction, arrangement and combinaton of thevarious parts may be made without exceeding the scope of the claim and Irescrvethe liberty of making such changcs,,as vma1y be thoughtdesirable. I

I claim:

In means for moldingtconcrete columns I. and beams into a monolithicstructure, the oomtanetion of ho (terms for said columns of form, aidbeams, and means for securing the ends of said beam forms to theircorresponding column forms;

